Java Reflection Annotation Find findAnnotation(Method method, Class type)

Description

find Annotation

License

Apache License

Declaration

public static <T extends Annotation> Optional<T> findAnnotation(Method method, Class<T> type) 

Method Source Code

//package com.java2s;
/*//from   ww w .  j ava 2  s  .  c  o m
 * Copyright 2013-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Optional;

public class Main {
    public static <T extends Annotation> Optional<T> findAnnotation(Method method, Class<T> type) {
        Class<?> clazz = method.getDeclaringClass();
        T annotation = method.getAnnotation(type);

        while (annotation == null) {
            clazz = clazz.getSuperclass();

            if (clazz == null || Object.class == clazz) {
                break;
            }

            try {
                annotation = clazz.getDeclaredMethod(method.getName(), method.getParameterTypes())
                        .getAnnotation(type);
            } catch (NoSuchMethodException e) {
                // No equivalent method found
            }
        }

        return Optional.ofNullable(annotation);
    }
}

Related

1. findAnnotation(final Class type, final Class annotationType)
2. findAnnotation(final Class targetAnnotation, final Class annotatedType)
3. findAnnotation(final Class annotationClass, final Class beanClass, final Field field)
4. findAnnotation(final Set annotations, final Class annotationType)
5. findAnnotation(Method method, Class annotationType)
6. findAnnotation(Set annotations, Class annotationClass)
7. findAnnotationClass( Class c, Class base)
8. findAnnotationDeclaringClass(Class annotationType, Class clazz)
9. findAnnotationDeclaringClass(Class annotationType, Class classToFind)